diff options
Diffstat (limited to 'gnuradio-examples/python/digital/transmit_path.py')
| -rw-r--r-- | gnuradio-examples/python/digital/transmit_path.py | 126 |
1 files changed, 20 insertions, 106 deletions
diff --git a/gnuradio-examples/python/digital/transmit_path.py b/gnuradio-examples/python/digital/transmit_path.py index 2819e87f4..11d370269 100644 --- a/gnuradio-examples/python/digital/transmit_path.py +++ b/gnuradio-examples/python/digital/transmit_path.py @@ -1,5 +1,5 @@ # -# Copyright 2005,2006,2007,2009 Free Software Foundation, Inc. +# Copyright 2005, 2006, 2007 Free Software Foundation, Inc. # # This file is part of GNU Radio # @@ -20,74 +20,43 @@ # from gnuradio import gr, gru, blks2 -from gnuradio import usrp from gnuradio import eng_notation import copy import sys -# from current dir -from pick_bitrate import pick_tx_bitrate -import usrp_options - # ///////////////////////////////////////////////////////////////////////////// # transmit path # ///////////////////////////////////////////////////////////////////////////// -class transmit_path(gr.hier_block2): +class transmit_path(gr.hier_block2): def __init__(self, modulator_class, options): ''' See below for what options should hold ''' gr.hier_block2.__init__(self, "transmit_path", - gr.io_signature(0, 0, 0), # Input signature - gr.io_signature(0, 0, 0)) # Output signature - + gr.io_signature(0, 0, 0), # Input signature + gr.io_signature(1, 1, gr.sizeof_gr_complex)) # Output signature + options = copy.copy(options) # make a copy so we can destructively modify self._verbose = options.verbose - self._tx_freq = options.tx_freq # tranmitter's center frequency self._tx_amplitude = options.tx_amplitude # digital amplitude sent to USRP self._bitrate = options.bitrate # desired bit rate - self._interp = options.interp # interpolating rate for the USRP (prelim) self._samples_per_symbol = options.samples_per_symbol # desired samples/baud - self._use_whitener_offset = options.use_whitener_offset # increment start of whitener XOR data - - self._modulator_class = modulator_class # the modulator_class we are using - - if self._tx_freq is None: - sys.stderr.write("-f FREQ or --freq FREQ or --tx-freq FREQ must be specified\n") - raise SystemExit - - # Set up USRP sink; also adjusts interp, samples_per_symbol, and bitrate - self._setup_usrp_sink(options) - # copy the final answers back into options for use by modulator - options.samples_per_symbol = self._samples_per_symbol - options.bitrate = self._bitrate - options.interp = self._interp + self._modulator_class = modulator_class # the modulator_class we are using # Get mod_kwargs mod_kwargs = self._modulator_class.extract_kwargs_from_options(options) - - # Set center frequency of USRP - ok = self.set_freq(self._tx_freq) - if not ok: - print "Failed to set Tx frequency to %s" % (eng_notation.num_to_str(self._tx_freq),) - raise ValueError # transmitter + modulator = self._modulator_class(**mod_kwargs) self.packet_transmitter = \ - blks2.mod_pkts(self._modulator_class(**mod_kwargs), + blks2.mod_pkts(modulator, access_code=None, msgq_limit=4, - pad_for_usrp=True, - use_whitener_offset=options.use_whitener_offset) - - - # Set the USRP for maximum transmit gain - # (Note that on the RFX cards this is a nop.) - #self.set_gain(self.u.gain_range()[1]) + pad_for_usrp=True) self.amp = gr.multiply_const_cc(1) self.set_tx_amplitude(self._tx_amplitude) @@ -96,47 +65,17 @@ class transmit_path(gr.hier_block2): if self._verbose: self._print_verbage() - # Create and setup transmit path flow graph - self.connect(self.packet_transmitter, self.amp, self.u) - - def _setup_usrp_sink(self, options): - """ - Creates a USRP sink, determines the settings for best bitrate, - and attaches to the transmitter's subdevice. - """ - self.u = usrp_options.create_usrp_sink(options) - dac_rate = self.u.dac_rate(); - - # derive values of bitrate, samples_per_symbol, and interp from desired info - (self._bitrate, self._samples_per_symbol, self._interp) = \ - pick_tx_bitrate(self._bitrate, self._modulator_class.bits_per_symbol(), - self._samples_per_symbol, self._interp, dac_rate, self.u.get_interp_rates()) - - self.u.set_interp(self._interp) - - - def set_freq(self, target_freq): - """ - Set the center frequency we're interested in. - - @param target_freq: frequency in Hz - @rypte: bool - - Tuning is a two step process. First we ask the front-end to - tune as close to the desired frequency as it can. Then we use - the result of that operation and our target_frequency to - determine the value for the digital up converter. - """ - return self.u.set_center_freq(target_freq) + # Connect components in the flowgraph + self.connect(self.packet_transmitter, self.amp, self) def set_tx_amplitude(self, ampl): """ Sets the transmit amplitude sent to the USRP - @param ampl the amplitude between 0.0 and 1.0 + @param: ampl 0 <= ampl < 32768. Try 8000 """ - self._tx_amplitude = max(0.0, min(ampl, 1.0)) + self._tx_amplitude = max(0.0, min(ampl, 32767.0)) self.amp.set_k(self._tx_amplitude) - + def send_pkt(self, payload='', eof=False): """ Calls the transmitter method to send a packet @@ -149,29 +88,21 @@ class transmit_path(gr.hier_block2): def samples_per_symbol(self): return self._samples_per_symbol - def interp(self): - return self._interp - def add_options(normal, expert): """ Adds transmitter-specific options to the Options Parser """ - add_freq_option(normal) if not normal.has_option('--bitrate'): - normal.add_option("-r", "--bitrate", type="eng_float", default=None, - help="specify bitrate. samples-per-symbol and interp/decim will be derived.") - usrp_options.add_tx_options(normal) - normal.add_option("--tx-amplitude", type="eng_float", default=0.15, metavar="AMPL", - help="set transmitter digital amplitude (0.0-1.0) [default=%default].") + normal.add_option("-r", "--bitrate", type="eng_float", default=100e3, + help="specify bitrate [default=%default].") + normal.add_option("", "--tx-amplitude", type="eng_float", default=12000, metavar="AMPL", + help="set transmitter digital amplitude: 0 <= AMPL < 32768 [default=%default]") normal.add_option("-v", "--verbose", action="store_true", default=False) - expert.add_option("-S", "--samples-per-symbol", type="int", default=None, + + expert.add_option("-S", "--samples-per-symbol", type="int", default=2, help="set samples/symbol [default=%default]") - expert.add_option("", "--tx-freq", type="eng_float", default=None, - help="set transmit frequency to FREQ [default=%default]", metavar="FREQ") expert.add_option("", "--log", action="store_true", default=False, help="Log all parts of flow graph to file (CAUTION: lots of data)") - expert.add_option("","--use-whitener-offset", action="store_true", default=False, - help="make sequential packets use different whitening") # Make a static method to call before instantiation add_options = staticmethod(add_options) @@ -180,25 +111,8 @@ class transmit_path(gr.hier_block2): """ Prints information about the transmit path """ - print "Using TX d'board %s" % (self.u,) print "Tx amplitude %s" % (self._tx_amplitude) print "modulation: %s" % (self._modulator_class.__name__) print "bitrate: %sb/s" % (eng_notation.num_to_str(self._bitrate)) print "samples/symbol: %3d" % (self._samples_per_symbol) - print "interp: %3d" % (self._interp) - print "Tx Frequency: %s" % (eng_notation.num_to_str(self._tx_freq)) - -def add_freq_option(parser): - """ - Hackery that has the -f / --freq option set both tx_freq and rx_freq - """ - def freq_callback(option, opt_str, value, parser): - parser.values.rx_freq = value - parser.values.tx_freq = value - - if not parser.has_option('--freq'): - parser.add_option('-f', '--freq', type="eng_float", - action="callback", callback=freq_callback, - help="set Tx and/or Rx frequency to FREQ [default=%default]", - metavar="FREQ") |